姜黄素的抗氧化及抗肿瘤活性研究_陈建平

姜黄素的抗氧化及抗肿瘤活性研究

陈建平，李琳，苏健裕

（华南理工大学轻工与食品学院，广东广州 510640）

摘要：本文采用分光光度法测定姜黄素对ABTS和DPPH自由基的清除能力；运用AAPH诱导红细胞氧化性溶血考察姜黄素对AAPH诱导人血红细胞损伤的抑制作用。通过MTT方法考察姜黄素对A375恶性黑色素瘤生长状态的影响，并用流式细胞仪检测细胞凋亡数量；运用Western blot测定姜黄素对JNK和Akt蛋白表达的影响。结果表明，姜黄素对DPPH和ABTS自由基具有较好的清除能力，呈浓度和时间依赖性；同时，姜黄素能有效抑制AAPH诱导红细胞溶血，当姜黄素为40 μM时，溶血抑制率达到52.78±1.03%。MTT结果表明，随着姜黄素浓度的升高，A375细胞存活率逐渐下降，当姜黄素为40 μM，A375的细胞存活率仅为21.50±1.60%。流式分析发现，随着姜黄素浓度的提高，细胞凋亡峰（SubG1）的含量逐渐增加。当姜黄素为40 μM时，细胞内SubG1峰的含量达到了63.30%。进一步Western blot分析发现姜黄素诱导A375细胞凋亡与上调JNK磷酸化的水平和下调AKt磷酸化的水平有关。

关键词：姜黄素；抗氧化；抗肿瘤

文章篇号：1673-9078(2014)12-11-15 DOI: 10.13982/j.mfst.1673-9078.2014.12.003 Antioxidant and Antitumor Activities of Curcumin

CHEN Jian-ping, LI Lin, SU Jian-yu

(College of Light Industry and Food Sciences, South China University of Technology,Guangzhou 510640, China) Abstract: In this paper, spectrophotometric method was employed to determine the ability of curcumin to scavenge 2,2-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals, and the oxidative hemolysis of erythrocytes induced by 2, 2′-azobis (2-amidinopropane) dihydrochloride (AAPH) was used to investigate the inhibitory effect of curcumin on AAPH-induced damage to human erythrocytes. The effect of curcumin on the viability of A375 malignant melanoma cells was measured by MTT assay, and the population of the apoptotic cells was detected by a flow cytometer. The effect of curcumin on the expression levels phosphorylated JNK and Akt was analyzed via Western blot assay. These results showed that curcumin exhibited strong scavenging effects on ABTS and DPPH free radicals in a dose- and time-dependent manner. Meanwhile, curcumin also effectively inhibited the AAPH-induced hemolysis of erythrocytes. The hemolysis inhibition rate of curcumin increased to 52.78 ± 1.03% at a concentration of 40 µM. The MTT assay showed that an increasing concentration of curcumin decreased the viability of A375 cells gradually. The cell viability after treatment with curcumin (40 µM) was only 21.50 ± 1.60%. Further flow cytometric studies showed that the SubG1 peak (apoptotic cells) increased in response to increasing curcumin concentrations. The SubG1 peak (apoptotic cells) reached 63.30% when the curcumin concentration was 40 μM. Further studies by Western blot assay demonstrated that the curcumin-induced apoptosis in A375 cells was related to upregulation of JNK phosphorylation and downregulation of Akt phosphorylation.

Key words: curcumin; antioxidant activity; antitumor activity

近年来，越来越多的研究表明，细胞内自由基产生的损伤可以导致癌症、动脉粥样硬化、心血管疾病、收稿日期：2014-05-31

基金项目：高等学校博士点基金新教师项目（20110172120033）；国家自然科学基金青年基金项目（31101278）；广东省产学研结合项目（2012B091100075）；“扬帆计划”引进创新创业团队专项资助（201312 H05）；华南理工大学中央高校基本科研业务费（2013ZZ0069）资助

作者简介：陈建平（1986-），男，博士研究生，研究方向为糖类物质及其药物制备与生物利用

通讯作者：苏健裕（1979-），男，博士，副研究员，研究方向为糖类物质及其药物制备与生物利用 免疫系统衰退和细胞衰老等多种疾病[1,2]，摄入外源性的抗氧化剂能有效地预防或抑制这些疾病的发生。目前由于人工合成的抗氧化剂有一定的毒副作用，可能会导致癌症或损伤肝脏，因此寻找天然有效的抗氧化剂成为目前研究的热点问题[3~4]。姜黄素（curcumin）是从姜科姜黄属植物姜黄根茎中提取的一种脂溶性酚类物质[5]。研究表明，姜黄素的结构中含有酚羟基，在细胞膜发生脂质过氧化反应时，其酚羟基可以发生氧化反应，能有效终止自由基反应，因而其表现出诸多生理活性，比如抗氧化、抗肿瘤、防止衰老等诸多功效[6]，成为近年来天然药物中的研究热点。尤其是姜黄

11